Submission #278587

#	Time	Username	Problem	Language	Result	Execution time	Memory
278587		rqi	Meetings (JOI19_meetings)	C++14	29 / 100	3064 ms	2592 KiB

meetings

#include "meetings.h"
#include <bits/stdc++.h>
using namespace std;

typedef pair<int, int> pi;

#define ins insert
#define sz(x) (int)(x).size()
#define mp make_pair
#define f first
#define s second

const int MOD = 1000000007;
const int mx = 2005;
set<int> below[mx];
bool leaved[mx];

void Solve(int N) {
	// int x = Query(0, 1, 2);
	// for (int u = 0; u < N - 1; ++u) {
	//   Bridge(u, u + 1);
	// }
	for(int i = 1; i < N; i++){
		for(int j = i+1; j < N; j++){
			int a = Query(0, i, j);
			if(a != i) below[a].ins(i);
			if(a != j) below[a].ins(j);
		}
	}
	for(int i = 0; i < N-1; i++){
		//cout << "Phase " << i << "\n";
		int leaf;
		for(int j = 1; j < N; j++){
			if(leaved[j]) continue;
			if(sz(below[j]) == 0){
				leaf = j;
				break;
			}
		}
		//cout << leaf << "\n";
		leaved[leaf] = 1;
		pi cur = mp(MOD, -1);
		for(int j = 0; j < N; j++){
			if(leaved[j]) continue;
			if(below[j].count(leaf)) cur = min(cur, mp(sz(below[j]), j));
		}
		if(cur.s == -1) cur.s = 0;
		for(int j = 0; j < N; j++){
			if(below[j].count(leaf)) below[j].erase(leaf);
		}
		Bridge(min(leaf, cur.s), max(leaf, cur.s));
	}
}

Compilation message (stderr)

meetings.cpp: In function 'void Solve(int)':
meetings.cpp:32:7: warning: 'leaf' may be used uninitialized in this function [-Wmaybe-uninitialized]
   32 |   int leaf;
      |       ^~~~

• Subtask 1: 7 / 7
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 0 / 71